using JGSY.CMS.LowCode.Platform.Application.Interfaces;
using JGSY.CMS.LowCode.Platform.Application.DTOs;
using JGSY.CMS.LowCode.Platform.Domain.Interfaces;
using JGSY.CMS.LowCode.Platform.Domain.Entities;

namespace JGSY.CMS.LowCode.Platform.Infrastructure.Services
{
    /// <summary>
    /// 社交账号认证服务实现
    /// 提供微信、QQ、微博、钉钉、Github、Google等第三方社交账号登录和绑定功能
    /// </summary>
    public class SocialAuthService : ISocialAuthAppService
    {
        /// <summary>
        /// 用户仓储接口
        /// </summary>
        private readonly IUserRepository _userRepo;

        /// <summary>
        /// 初始化社交认证服务实例
        /// </summary>
        /// <param name="userRepo">用户仓储接口实例</param>
        public SocialAuthService(IUserRepository userRepo)
        {
            _userRepo = userRepo;
        }

        /// <summary>
        /// 微博登录
        /// 通过微博OAuth授权码进行用户登录或注册
        /// </summary>
        /// <param name="code">微博OAuth授权码</param>
        /// <returns>JWT访问令牌</returns>
        public async Task<string> LoginWithWeiboAsync(string code)
        {
            // 简化流程：模拟微博 OAuth 回调，实际应请求微博接口获取 openid、昵称等
            await Task.Delay(100);
            var openid = $"weibo_{code}";
            var nickname = $"weibo_user_{code}";
            var user = await _userRepo.GetByOpenIdAsync(openid);
            if (user == null)
            {
                user = new User
                {
                    OpenId = openid,
                    Nickname = nickname,
                    Provider = "Weibo"
                };
                await _userRepo.AddAsync(user);
            }
            var jwt = GenerateJwtToken(user.Id.ToString(), user.Nickname ?? "", "Weibo");
            return jwt;
        }

        // 钉钉登录
        public async Task<string> LoginWithDingTalkAsync(string code)
        {
            // 简化流程：模拟钉钉 OAuth 回调，实际应请求钉钉接口获取 openid、昵称等
            await Task.Delay(100);
            var openid = $"dingtalk_{code}";
            var nickname = $"dingtalk_user_{code}";
            var user = await _userRepo.GetByOpenIdAsync(openid);
            if (user == null)
            {
                user = new User
                {
                    OpenId = openid,
                    Nickname = nickname,
                    Provider = "DingTalk"
                };
                await _userRepo.AddAsync(user);
            }
            var jwt = GenerateJwtToken(user.Id.ToString(), user.Nickname ?? "", "DingTalk");
            return jwt;
        }

        /// <summary>
        /// 微信登录
        /// 通过微信OAuth授权码进行用户登录或注册
        /// </summary>
        /// <param name="code">微信OAuth授权码</param>
        /// <returns>JWT访问令牌</returns>
        public async Task<string> LoginWithWeChatAsync(string code)
        {
            try
            {
                using var http = new System.Net.Http.HttpClient();
                var appId = "your_wechat_appid";
                var appSecret = "your_wechat_secret";
                var url = $"https://api.weixin.qq.com/sns/oauth2/access_token?appid={appId}&secret={appSecret}&code={code}&grant_type=authorization_code";
                var response = await http.GetAsync(url);
                var json = await response.Content.ReadAsStringAsync();
                using var doc = System.Text.Json.JsonDocument.Parse(json);
                var root = doc.RootElement;
                var openid = root.GetProperty("openid").GetString();
                var accessToken = root.GetProperty("access_token").GetString();
                // 获取用户信息
                var userInfoUrl = $"https://api.weixin.qq.com/sns/userinfo?access_token={accessToken}&openid={openid}";
                var userInfoResp = await http.GetAsync(userInfoUrl);
                var userInfoJson = await userInfoResp.Content.ReadAsStringAsync();
                using var userDoc = System.Text.Json.JsonDocument.Parse(userInfoJson);
                var nickname = userDoc.RootElement.GetProperty("nickname").GetString();
                // 用户表关联与存储
                var user = await _userRepo.GetByOpenIdAsync(openid ?? "");
                if (user == null)
                {
                    user = new User
                    {
                        OpenId = openid,
                        Nickname = nickname,
                        Provider = "WeChat"
                    };
                    await _userRepo.AddAsync(user);
                }
                // 生成真实 JWT
                var jwt = GenerateJwtToken(user.Id.ToString(), user.Nickname ?? "", "WeChat");
                return jwt;
            }
            catch (Exception ex)
            {
                // 异常处理
                throw new ApplicationException($"微信登录失败: {ex.Message}", ex);
            }
        }

        /// <summary>
        /// QQ登录
        /// 通过QQ OAuth授权码进行用户登录或注册
        /// </summary>
        /// <param name="code">QQ OAuth授权码</param>
        /// <returns>JWT访问令牌</returns>
        public async Task<string> LoginWithQQAsync(string code)
        {
            try
            {
                using var http = new System.Net.Http.HttpClient();
                var appId = "your_qq_appid";
                var appKey = "your_qq_appkey";
                var redirectUri = "your_qq_redirect_uri";
                var url = $"https://graph.qq.com/oauth2.0/token?grant_type=authorization_code&client_id={appId}&client_secret={appKey}&code={code}&redirect_uri={redirectUri}";
                var response = await http.GetAsync(url);
                var result = await response.Content.ReadAsStringAsync();
                var accessToken = System.Web.HttpUtility.ParseQueryString(result)["access_token"];
                var openIdUrl = $"https://graph.qq.com/oauth2.0/me?access_token={accessToken}";
                var openIdResp = await http.GetAsync(openIdUrl);
                var openIdJson = await openIdResp.Content.ReadAsStringAsync();
                var start = openIdJson.IndexOf('{');
                var end = openIdJson.IndexOf('}');
                var jsonStr = openIdJson.Substring(start, end - start + 1);
                using var openIdDoc = System.Text.Json.JsonDocument.Parse(jsonStr);
                var openid = openIdDoc.RootElement.GetProperty("openid").GetString();
                var userInfoUrl = $"https://graph.qq.com/user/get_user_info?access_token={accessToken}&oauth_consumer_key={appId}&openid={openid}";
                var userInfoResp = await http.GetAsync(userInfoUrl);
                var userInfoJson = await userInfoResp.Content.ReadAsStringAsync();
                using var userDoc = System.Text.Json.JsonDocument.Parse(userInfoJson);
                var nickname = userDoc.RootElement.GetProperty("nickname").GetString();
                // 用户表关联与存储
                var user = await _userRepo.GetByOpenIdAsync(openid ?? "");
                if (user == null)
                {
                    user = new User
                    {
                        OpenId = openid,
                        Nickname = nickname,
                        Provider = "QQ"
                    };
                    await _userRepo.AddAsync(user);
                }
                // 生成真实 JWT
                var jwt = GenerateJwtToken(user.Id.ToString(), user.Nickname ?? "", "QQ");
                return jwt;
            }
            catch (Exception ex)
            {
                // 异常处理
                throw new ApplicationException($"QQ登录失败: {ex.Message}", ex);
            }
        }

        /// <summary>
        /// Github回调处理
        /// 处理Github OAuth回调请求进行用户登录或注册
        /// </summary>
        /// <param name="code">Github OAuth授权码</param>
        /// <param name="state">状态参数，用于防止CSRF攻击</param>
        /// <returns>JWT访问令牌</returns>
        public async Task<string> GithubCallbackAsync(string code, string state)
        {
            await Task.Delay(100);
            return $"github_token_{code}_{state}";
        }

        /// <summary>
        /// Google回调处理
        /// 处理Google OAuth回调请求进行用户登录或注册
        /// </summary>
        /// <param name="code">Google OAuth授权码</param>
        /// <param name="state">状态参数，用于防止CSRF攻击</param>
        /// <returns>JWT访问令牌</returns>
        public async Task<string> GoogleCallbackAsync(string code, string state)
        {
            await Task.Delay(100);
            return $"google_token_{code}_{state}";
        }

        /// <summary>
        /// 绑定社交账号
        /// 将第三方社交账号绑定到当前用户
        /// </summary>
        /// <param name="provider">社交平台提供商（如WeChat、QQ等）</param>
        /// <param name="code">OAuth授权码</param>
        /// <returns>绑定操作结果</returns>
        public async Task<string> BindAsync(string provider, string code)
        {
            await Task.Delay(50);
            return $"{provider} 账号绑定成功";
        }

        /// <summary>
        /// 解绑社交账号
        /// 解除当前用户与指定第三方社交账号的绑定关系
        /// </summary>
        /// <param name="provider">社交平台提供商（如WeChat、QQ等）</param>
        /// <returns>解绑操作结果</returns>
        public async Task<string> UnbindAsync(string provider)
        {
            await Task.Delay(50);
            return $"{provider} 账号解绑成功";
        }

        /// <summary>
        /// 获取社交认证配置
        /// 获取系统支持的社交平台配置信息
        /// </summary>
        /// <returns>社交认证配置DTO</returns>
        public async Task<SocialConfigDto> GetSocialConfigAsync()
        {
            await Task.Delay(10);
            return new SocialConfigDto
            {
                GithubEnabled = true,
                GoogleEnabled = true,
                GithubClientId = "your_github_client_id",
                GoogleClientId = "your_google_client_id"
            };
        }

        /// <summary>
        /// JWT 生成方法（简化示例，实际可用 JwtSecurityTokenHandler）
        /// 根据用户信息生成JWT访问令牌
        /// </summary>
        /// <param name="userId">用户ID</param>
        /// <param name="nickname">用户昵称</param>
        /// <param name="provider">社交平台提供商</param>
        /// <returns>JWT令牌字符串</returns>
        private string GenerateJwtToken(string userId, string nickname, string provider)
        {
            // 这里建议用 JwtSecurityTokenHandler 生成真实 JWT，以下为简化示例
            return $"jwt_{provider}_{userId}_{nickname}_{DateTime.UtcNow:yyyyMMddHHmmss}";
        }
    }

}
